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js-on-sx: Function.prototype.isPrototypeOf recognises callable recvs (+3)

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Tests expected Function.prototype.isPrototypeOf(Number/String/…) ===
true because every built-in ctor inherits from Function.prototype.
Our model doesn't link Number.__proto__ anywhere, so the default
Object.isPrototypeOf walked an empty chain and returned false.

Fix: post-definition dict-set! adds an explicit isPrototypeOf override
on js-function-global.prototype that returns (js-function? x) — which
accepts lambdas, functions, components, and __callable__ dicts. Good
enough to satisfy the spec for every case that isn't a bespoke proto
chain.

Unit 521/522, slice 148/148 unchanged.
Wide scoreboard: 156/300 → 159/300 (+3, Number/S15.7.3_A7 and the
three S15.5.3_A2 / S15.6.3_A2 / S15.9.3_A2 twins).
This commit is contained in:
giles
2026-04-24 13:07:33 +00:00
parent 52fc87f222
commit 81059861fd
3 changed files with 97 additions and 87 deletions
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27
lib/js/test262-scoreboard.md
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@@ -1,36 +1,37 @@
# test262 scoreboard
Pinned commit: `d5e73fc8d2c663554fb72e2380a8c2bc1a318a33`
Wall time: 269.2s
Wall time: 268.6s
**Total:** 156/300 runnable passed (52.0%). Raw: pass=156 fail=133 skip=1597 timeout=11 total=1897.
**Total:** 159/300 runnable passed (53.0%). Raw: pass=159 fail=131 skip=1597 timeout=10 total=1897.
## Top failure modes
- **83x** Test262Error (assertion failed)
- **42x** TypeError: not a function
- **11x** Timeout
- **79x** Test262Error (assertion failed)
- **43x** TypeError: not a function
- **10x** Timeout
- **2x** ReferenceError (undefined symbol)
- **2x** Unhandled: Not callable: {:__proto__ {:toLowerCase <lambda(&rest, args)
- **2x** Unhandled: Not callable: \\\
- **1x** SyntaxError (parse/unsupported syntax)
- **1x** Unhandled: Not callable: {:__proto__ {:valueOf <lambda()> :propertyIsEn
- **1x** Unhandled: js-transpile-binop: unsupported op: >>>\
## Categories (worst pass-rate first, min 10 runnable)
| Category | Pass | Fail | Skip | Timeout | Total | Pass % |
|---|---:|---:|---:|---:|---:|---:|
| built-ins/String | 38 | 56 | 1123 | 6 | 1223 | 38.0% |
| built-ins/String | 39 | 56 | 1123 | 5 | 1223 | 39.0% |
| built-ins/Math | 43 | 56 | 227 | 1 | 327 | 43.0% |
| built-ins/Number | 75 | 21 | 240 | 4 | 340 | 75.0% |
| built-ins/Number | 77 | 19 | 240 | 4 | 340 | 77.0% |
## Per-category top failures (min 10 runnable, worst first)
### built-ins/String (38/100 — 38.0%)
### built-ins/String (39/100 — 39.0%)
- **42x** Test262Error (assertion failed)
- **6x** Timeout
- **6x** TypeError: not a function
- **40x** Test262Error (assertion failed)
- **7x** TypeError: not a function
- **5x** Timeout
- **2x** ReferenceError (undefined symbol)
- **2x** Unhandled: Not callable: {:__proto__ {:toLowerCase <lambda(&rest, args)
@@ -40,7 +41,7 @@ Wall time: 269.2s
- **20x** Test262Error (assertion failed)
- **1x** Timeout
### built-ins/Number (75/100 — 75.0%)
### built-ins/Number (77/100 — 77.0%)
- **21x** Test262Error (assertion failed)
- **19x** Test262Error (assertion failed)
- **4x** Timeout